The NDF may have up to three dimensions. If it has three dimensions, then the filter is applied in turn to each plane in the cube and the result written to the corresponding plane in the output cube. The orientation of the smoothing plane can be specified using the AXES parameter.
The values given will be rounded up to positive odd integers if necessary. If a null (!) value is supplied, the value used is just sufficient to accommodate the Gaussian PSF out to a radius of 3 standard deviations. Note that the time taken to perform the smoothing increases in approximate proportion to the value of this parameter for a circular Gaussian, and in proportion to the product of the two box sizes for an elliptical Gaussian. [!]
By default, a null (!) value is used for WLIM, which causes the pattern of bad pixels to be propagated from the input image to the output image unchanged. In this case, smoothed output values are only calculated for those pixels which are not bad in the input image.
If a numerical value is given for WLIM, then it specifies the minimum PSF-weighted fraction of good pixels which must be present in the PSF area (i.e. box) in order to generate a good output pixel. The maximum value, in the absence of bad pixels, is unity. If the specified minimum fraction of good input pixels is not present, then a bad output pixel will result, otherwise a smoothed output value will be calculated. The value of this parameter should lie between 1E-6 and 1.0. [!]
KAPPA --- Kernel Application Package